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Amorim J, Vásquez V, Cabrera A, Martínez M, Carpio J. In Silico and In Vitro Identification of 1,8-Dihydroxy-4,5-dinitroanthraquinone as a New Antibacterial Agent against Staphylococcus aureus and Enterococcus faecalis. Molecules 2023; 29:203. [PMID: 38202786 PMCID: PMC10779913 DOI: 10.3390/molecules29010203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 12/13/2023] [Accepted: 12/20/2023] [Indexed: 01/12/2024] Open
Abstract
Increasing rates of bacterial resistance to antibiotics are a growing concern worldwide. The search for potential new antibiotics has included several natural products such as anthraquinones. However, comparatively less attention has been given to anthraquinones that exhibit functional groups that are uncommon in nature. In this work, 114 anthraquinones were evaluated using in silico methods to identify inhibitors of the enzyme phosphopantetheine adenylyltransferase (PPAT) of Staphylococcus aureus, Enterococcus faecalis, and Escherichia coli. Virtual screenings based on molecular docking and the pharmacophore model, molecular dynamics simulations, and free energy calculations pointed to 1,8-dihydroxy-4,5-dinitroanthraquinone (DHDNA) as the most promising inhibitor. In addition, these analyses highlighted the contribution of the nitro group to the affinity of this anthraquinone for the nucleotide-binding site of PPAT. Furthermore, DHDNA was active in vitro towards Gram-positive bacteria with minimum inhibitory concentration (MIC) values of 31.25 µg/mL for S. aureus and 62.5 µg/mL for E. faecalis against both antibiotic-resistant isolates and reference strains but was ineffective against E. coli. Experiments on kill-time kinetics indicated that, at the tested concentrations, DHDNA produced bacteriostatic effects on both Gram-positive bacteria. Overall, our results present DHDNA as a potential PPAT inhibitor, showing antibacterial activity against antibiotic-resistant isolates of S. aureus and E. faecalis, findings that point to nitro groups as key to explaining these results.
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Affiliation(s)
| | | | | | | | - Juan Carpio
- Unidad de Salud y Bienestar, Facultad de Bioquímica y Farmacia, Universidad Católica de Cuenca, Av. Las Américas, Cuenca 010105, Ecuador
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de Oliveira SV, Dos Reis T, Amorim J, Rocha FS, Marques MM, Guerra ES, Hanna R, Gallo CB. Efficacy of photobiomodulation therapy on healing of ionizing irradiated bone: a systematic review of in vivo animal studies. Lasers Med Sci 2022; 37:3379-3392. [PMID: 36194304 DOI: 10.1007/s10103-022-03649-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 09/22/2022] [Indexed: 12/09/2022]
Abstract
This systematic review aimed to answer the research focused question: What are the effects of photobiomodulation (PBM) therapy on bone healing after ionizing irradiation in animal models? The EMBASE, LILACS, LIVIVO, PubMed, Scopus, and Web of Science databases, including gray literature, were searched using the following keywords: "Head and Neck Neoplasms"; "Ionizing Radiation"; "Low-Level Light Therapy"; and "Bone regeneration", focusing on the primary studies that assessed the effects of PBM therapy on animal models of irradiated bone. Six studies have met the eligibility criteria and presented an overall regular quality according to the risk of bias assessment tools. All the studies utilized rat animal model and near-infrared laser PBM at low power output setting. Most of the studies showed increased new bone formation, osteocytes, osteoblasts, and vascularization networking, as a result of PBM therapy. However, only one out of the six studies has not shown any differences in bone healing in both lased and non-lased animal groups. Nevertheless, PBM therapy is a potential tool to improve bone healing induced by ionizing radiation. However, due to the scarce number of studies and the great variability of laser parameters and treatment protocols, a clear conclusion cannot be drawn. Hence, extensive preclinical in vivo studies are warranted to ensure these beneficial effects have been addressed prior to translational clinical trials.
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Affiliation(s)
- Samanta Vicente de Oliveira
- Department of Stomatology, School of Dentistry of the Universidade de Sao Paulo, Av. Prof. Lineu Prestes, 2227 - Butantã, Sao Paulo, SP, Brazil
| | - Thaís Dos Reis
- Department of Stomatology, School of Dentistry of the Universidade de Sao Paulo, Av. Prof. Lineu Prestes, 2227 - Butantã, Sao Paulo, SP, Brazil
| | - Juliana Amorim
- Laboratory of Oral Histopathology, Health Sciences Faculty of the University of Brasília, Brasilia, DF, Brazil
| | - Flaviana Soares Rocha
- Laboratory of Oral Histopathology, Health Sciences Faculty of the University of Brasília, Brasilia, DF, Brazil
| | - Márcia Martins Marques
- Post Graduation Program, School of Dentistry, Ibirapuera University, Sao Paulo, SP, Brazil
| | - Eliete Silva Guerra
- Laboratory of Oral Histopathology, Health Sciences Faculty of the University of Brasília, Brasilia, DF, Brazil
| | - Reem Hanna
- Department of Surgical Sciences and Integrated Diagnostics, Laser Therapy Centre of the University of Genoa, Genoa, Italy.,Department of Oral Surgery, King's College Hospital NHS Foundation Trust, London, UK
| | - Camila Barros Gallo
- Department of Stomatology, School of Dentistry of the Universidade de Sao Paulo, Av. Prof. Lineu Prestes, 2227 - Butantã, Sao Paulo, SP, Brazil.
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Leite PM, Freitas A, Amorim J, Figueiredo RCD, Bertolucci S, Faraco A, Martins M, Carvalho MG, Castilho R. In vitro anticoagulant activity of selected medicinal plants: potential interactions with warfarin and development of new anticoagulants. J Basic Clin Physiol Pharmacol 2021; 33:499-510. [PMID: 34273917 DOI: 10.1515/jbcpp-2021-0079] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 06/28/2021] [Indexed: 12/26/2022]
Abstract
OBJECTIVES Warfarin is the most widely used anticoagulant in the world, but it has several limitations including its narrow therapeutic range, need for dose adjustment and high potential for interactions. The simultaneous use of other drugs or even medicinal plants and certain foods could interfere with its therapeutic activity. In this context, this study aims to investigate the in vitro anticoagulant potential and phytochemical constitution of 17 plants selected from a previous clinical cross-sectional study (2014), that investigated the habits of plant utilization among patients taking warfarin. METHODS Ethanol extracts and essential oils were evaluated, in vitro, as to their effect in the prothrombin time (PT) and activated partial thromboplastin time (aPTT) tests. Four species that presented aPTT >50 s were selected for phytochemical evaluation. RESULTS Thirteen of the 17 plants selected demonstrated a significant anticoagulant effect in at least one of the evaluated parameters. Citrus sinensis (PT=14.75 and aPTT=53.15), Mentha crispa (aPTT=51.25), Mikania laevigata (PT=14.90 and aPTT=52.10), and Nasturtium officinale (aPTT=50.55) showed greater anticoagulant potential compared to normal plasma pool (PT=12.25 and aPTT=37.73). Chemical profiles of these four species were obtained, and certain compounds were identified: rosmarinic acid from M. crispa and isoorientin from N. officinale. CONCLUSIONS Thus, the results of this study could be a useful indicator for clinical practice towards the possibility of interaction between these plants and anticoagulants, although further clinical research is needed taking into consideration the limitations of in vitro studies. These findings also suggest that further research into the action of these plants could be of real clinical value in identifying potential alternative anticoagulant therapies.
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Affiliation(s)
| | - Aline Freitas
- Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Juliana Amorim
- Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | | | | | - André Faraco
- Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Maria Martins
- Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Maria G Carvalho
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Rachel Castilho
- Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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Fontes R, Rodrigues J, Oliveira C, Peixoto M, Couto E, Freitas D, Cunha J, Amorim J, Nabiço R, Marques A. P-207 FLOT in clinical practice: Retrospective analysis of an oncological center. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.05.261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Giannasi L, Meira e Cruz M, Rezende T, Dutra M, Nacif S, Oliveira E, Oliveira L, Oliveira W, Rode S, Nazário L, Silvestre P, Bacigalupo E, Amorim J, Salgado M, Gomes M. 0804 Sleep Bruxism, Awake Bruxism and Sleep Related Breathing Disorders in Adults With Down Syndrome. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.800] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
To our knowledge, no studies have accessed theawake bruxism (AB) and stage by stage sleep bruxism (SB) in adults with Down syndrome. Recent works have shown that portable PSG systems are accurate for SB assessment even in the absence of audio-video recording. We aimed to evaluate the prevalence of awake bruxism, stage-by-stage sleep bruxism and Sleep Related Breathing Disorders (SRBD) in adults with Down syndrome.
Methods
Twenty-three adults with Down Syndrome (DS) were enrolled in this study. General health, dental status, parafunctional habits and temporomandibular symptoms were assessed. The history of SB/AB was taken from a questionnaire to the caregivers. A portable PSG type II system (Embla Embletta MPR+PG ST+Proxy, Natus, California-USA) was used to perform a full-sleep study at patients’ home. RMMA activity was defined as low (>1 and <2 episodes/h of sleep), moderate (>2 and <4 episodes/h of sleep), or high (>4 episodes/h of sleep). PSG diagnose of SB was assumed if RMMA index was >2 episodes/h of sleep.
Results
According to caregiver’s report, AB was present in all patients whereas only 13.1% had SB. PSG records showed a SB prevalence of 91.3%, with a mean RMMA index 40.0±30.0/h. Only 2 (8,7%) showed RMMA index of 0.0/h. SB episodes were predominant in N3 and REM sleep stage in 14 and 9 patients, respectively. All but one (95,7%) patient (isolated snoring) presented with OSA (AHI=32.8±28.6). A unique TMD symptom (pain on palpation) was present in 8,7% of the global sample.
Conclusion
The high prevalence of “definitive SB” together with the high prevalence of OSA and snoring point in favor to the recommendation of routine PSG in adults with DS. Furthermore, the low sensitivity of parent-oriented questionnaires reinforces the need of more accurate assessment tools in order to get a better standard of care in this particular group of patients.
Support
State of Sao Paulo Research Support Foundation - FAPESP grant number: 2017/06835-8
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Affiliation(s)
- L Giannasi
- COAT - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - M Meira e Cruz
- Sleep Unit, Cardiovascular Center of University of Lisbon, Lisbon School of Medicine, Lisbon, PORTUGAL
| | - T Rezende
- COAT - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - M Dutra
- CEBAPE - Institute of Science and Technology, CEBAPE - Institute of Science and Technology, BRAZIL
| | - S Nacif
- Hospital do Servidor Público Estadual de São Paulo, São Paulo, BRAZIL
| | - E Oliveira
- Hospital do Servidor Público Estadual de São Paulo, São Paulo, BRAZIL
| | - L Oliveira
- University Center of Anápolis-UniEnvagélica, Goiás, BRAZIL
| | - W Oliveira
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - S Rode
- COAT - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - L Nazário
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - P Silvestre
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - E Bacigalupo
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - J Amorim
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - M Salgado
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - M Gomes
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
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Giannasi L, Gomes M, Oliveira L, Nacif S, Oliveira E, Rezende T, Dutra M, Bacigalupo E, Soviero L, Nazário L, Oliveira W, Rode S, Amorim J, Salgado M, Meira e Cruz M. 0657 Impact of Treatment With Mandibular Advancement Oral Appliance on Respiratory Parameters, Sleep and Cardiometabolic Risk Factors of CPAP Non-Adherent Patients With Severe Obstructive Sleep Apnea. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Obstructive sleep apnea (OSA) may trigger systemic changes linked to important cardiometabolic risk factors such as hypertension, stroke and diabetes II. As a life-threatening, multifactorial disorder, OSA demands a multiprofessional approach. The most common worldwide treatments are Continuous Positive Airway Pressure (CPAP) and Mandibular Advancement Oral Appliance (OAm). The aim of this study was to evaluate the impact of OAm treatment on CPAP non-adherent patients with severe OSA, comparing objective and subjective data between baseline and follow up.
Methods
A prospective study was carried out including non-adherent severe OSA patients, which were referred to OAm therapy evaluation. Patients presenting with snoring, gasping/choking during sleep, fatigue and daily sleepiness were evaluated by a sleep medicine specialist and the diagnosis of severe OSA with a basal polysomnography (PSG). All the patients were treated with a standard OAm (PMPositioner®). Baseline and Follow up (6 months) sleep parameters (PSG and Epworth Sleepiness Scale - ESS) were compared to assess treatment efficacy.
Results
Seventeen patients (9 with hypertension and 8 with hypertension + diabetes) met the inclusion criteria and 13 finished the protocol. After treatment with OAm the following parameters improved significantly: OSA severity (44.5±13.5 to 9.0±4.3, p≤0.001), ODI (46.8±11.6 to 12.1±9.1(p<0.05)), REM (18.4± 4.8 to 21.5± 2.9 (p<0.05)) and SaO2nadir (75.7± 9.4 to 87.0±3.6, p<0.001), ESS (p<0.005). Ten patients (58%) reported a reduction either in systolic and diastolic blood pressure with 3 of them (30%) reduced the hypertensive drug dose.
Conclusion
Our findings show that OAm is a safe and effective treatment option to CPAP non-adherent severe OSA patients. Furthermore OAm therapy had also a positive impact on cardiometabolic risk factors which are particularly relevant outcomes in OSA patients.
Support
State of Sao Paulo Research Support Foundation (FAPESP).
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Affiliation(s)
- L Giannasi
- COAT - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - M Gomes
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - L Oliveira
- University Center of Anápolis-UniEnvangélica, Goiás, BRAZIL
| | - S Nacif
- Hospital do Servidor Público Estadual de São Paulo - IAMSPE, São Paulo, BRAZIL
| | - E Oliveira
- Hospital do Servidor Público Estadual de São Paulo - IAMSPE, São Paulo, BRAZIL
| | - T Rezende
- COAT - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - M Dutra
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - E Bacigalupo
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - L Soviero
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - L Nazário
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - W Oliveira
- COAT - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - S Rode
- COAT - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - J Amorim
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - M Salgado
- CEBAPE - Institute of Science and Technology, São José dos Campos, BRAZIL
| | - M Meira e Cruz
- Sleep Unit, Cardiovascular Center of University of Lisbon, Lisbon School of Medicine, Lisbon, PORTUGAL
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Vieira J, Amorim J, Martí-Bonmatí L, Alberich-Bayarri Á, França M. Quantifying steatosis in the liver and pancreas with MRI in patient with chronic liver disease. Radiología (English Edition) 2020. [DOI: 10.1016/j.rxeng.2019.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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DeClue AE, Axiak-Bechtel S, Cowan CF, Zhang Y, Amorim J, Halpin R, Melillo GN, Hagan C. Transportation and Routine Veterinary Interventions Alter Immune Function in the Dog. Top Companion Anim Med 2020; 39:100408. [PMID: 32482288 DOI: 10.1016/j.tcam.2020.100408] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 01/28/2020] [Accepted: 01/29/2020] [Indexed: 01/02/2023]
Abstract
Rapid activation of the hypothalamic pituitary adrenal axis and the sympathetic nervous system are hallmarks of the acute stress response and these systems interact with the immune system by signaling though glucocorticoid and adrenergic receptors on immune cells. There is limited information about the effect of these physiologic responses on immunologic parameters of pet dogs enrolled in clinical studies. The objective of this study was to evaluate how travel, instrumentation, and hospitalization alter immunologic parameters in pet dogs. Blood was collected from healthy dogs in a home environment and from healthy dogs at the time of presentation to the hospital and after instrumentation and 24 hours of hospitalization. We found that lipopolysaccharide (LPS)-induced downregulation of toll like receptor 4 (TLR4) was blunted in dogs exposed to stress. Neutrophil and monocyte major histocompatibility complex class II (MHCII) expression increased after transportation to the veterinary hospital but then became similar to that of the control dogs at the end of hospitalization. Peripheral blood mononuclear cell cytotoxicity function was blunted in dogs exposed to the stress of transportation as well as hospitalization. Neutrophil apoptosis was greater in dogs exposed to stress compared to controls although this effect significantly decreased after hospitalization stress. Conversely, stress did not alter induced or spontaneous cytokine production from leukocytes, neutrophil or monocyte expression of TLR4, LPS-induced downregulation of monocyte TLR4, LPS-induced neutrophil and monocyte expression of MHCII or peripheral blood lymphocyte phenotype. Transportation and instrumentation/hospitalization stress should be considered when interpreting immunologic studies in pet dogs.
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Affiliation(s)
- Amy E DeClue
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, 900 E. Campus Dr. University of Missouri, Columbia, MO, USA.
| | - Sandra Axiak-Bechtel
- Comparative Oncology Laboratory, College of Veterinary Medicine, 900 E. Campus Dr. University of Missouri, Columbia, MO, USA
| | - Cynthia Friedman Cowan
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, 900 E. Campus Dr. University of Missouri, Columbia, MO, USA
| | - Yan Zhang
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, 900 E. Campus Dr. University of Missouri, Columbia, MO, USA
| | - Juliana Amorim
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, 900 E. Campus Dr. University of Missouri, Columbia, MO, USA
| | - Rachel Halpin
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, 900 E. Campus Dr. University of Missouri, Columbia, MO, USA
| | - Gabrielle N Melillo
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, 900 E. Campus Dr. University of Missouri, Columbia, MO, USA
| | - Catherine Hagan
- Department of Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, MO, USA
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Vieira J, Amorim J, Martí-Bonmatí L, Alberich-Bayarri Á, França M. Quantifying steatosis in the liver and pancreas with MRI in patient with chronic liver disease. Radiologia (Engl Ed) 2020; 62:222-228. [PMID: 31932016 DOI: 10.1016/j.rx.2019.11.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 09/08/2019] [Accepted: 11/04/2019] [Indexed: 12/13/2022]
Abstract
AIM To compare pancreatic and hepatic steatosis quantified by proton density fat fraction (PDFF) on magnetic resonance imaging (MRI) in patients with chronic liver disease. MATERIAL AND METHODS This cross-sectional study included 46 adult patients who underwent liver biopsy for chronic viral hepatitis (n=19) or other chronic non-alcoholic liver diseases (NALD) (n=27). Liver biopsy was used as the gold standard for diagnosing and grading hepatic steatosis. All patients underwent clinical evaluation and MRI with a multi-echo chemical shift-encoded (MECSE) gradient-echo sequence for liver and pancreas PDFF quantification. We used Spearman's correlation coefficient to determine the degree of association between hepatic PDFF and steatosis grade, and between pancreatic PDFF and steatosis grade and hepatic PDFF. To compare the chronic viral hepatitis group and the NALD group, we used t-tests for continuous or ordinal variables and chi-square tests for categorical variables. RESULTS Hepatic PDFF measurements correlated with steatosis grades (RS=0.875, p<0.001). Pancreatic PDFF correlated with hepatic steatosis grades (RS=0.573, p<0.001) and hepatic PDFF measurements (RS=0.536, p<0.001). In the subgroup of patients with chronic NALD, the correlations remained significant between pancreatic PDFF and hepatic PDFF (RS=0.632, p<0.001) and between pancreatic PDFF and liver steatosis (RS=0.608, p<0.001); however, in the subgroup of patients with viral hepatitis these correlations were no longer significant. CONCLUSION Pancreatic fat deposition correlates with hepatic steatosis in patients with chronic NALD, but not in those with chronic viral hepatitis.
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Affiliation(s)
- J Vieira
- Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidad de Oporto, Oporto, Portugal.
| | - J Amorim
- Departamento de Diagnóstico por la Imagen, Centro Hospitalar do Porto, Oporto, Portugal; Escola de Medicina, Universidade do Minho, Braga, Portugal; ICVS/3B's, Instituto de Investigación de Ciencias de la Vida y la Salud, Universidade do Minho, Braga, Portugal
| | - L Martí-Bonmatí
- Departamento de Radiología y Grupo de Investigación Biomédica en Imagen GIBI2(30). Hospital Universitario y Politécnico La Fe e Instituto de Investigación Sanitaria La Fe, Valencia, España
| | - Á Alberich-Bayarri
- Departamento de Radiología y Grupo de Investigación Biomédica en Imagen GIBI2(30). Hospital Universitario y Politécnico La Fe e Instituto de Investigación Sanitaria La Fe, Valencia, España; Quantitative Imaging Biomarkers in Medicine (QUIBIM), Valencia, España
| | - M França
- Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidad de Oporto, Oporto, Portugal; Departamento de Diagnóstico por la Imagen, Centro Hospitalar do Porto, Oporto, Portugal; i3S, Instituto de Investigacão e Inovação em Saúde, IBMC, Instituto de Biología Molecular y Celular, Oporto, Portugal
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Jaffey JA, Amorim J, DeClue AE. Effects of calcitriol on phagocytic function, toll-like receptor 4 expression, and cytokine production of canine leukocytes. Am J Vet Res 2019; 79:1064-1070. [PMID: 30256140 DOI: 10.2460/ajvr.79.10.1064] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine the in vitro effects of calcitriol on indicators of immune system function in blood samples collected from healthy dogs. SAMPLE Blood samples from 8 healthy adult dogs. PROCEDURES Blood samples were incubated with calcitriol (10-7M) or control substance for 24 hours. Afterward, lipopolysaccharide (LPS)-, lipoteichoic acid (LTA)-, and N-acetylmuramyl-l-alanyl-d-isoglutamine hydrate (MDP)-stimulated leukocyte production of tumor necrosis factor (TNF) and interleukin-10 (IL10) were measured with a canine-specific multiplex assay. Phagocytosis of opsonized Escherichia coli and leukocyte expression of constitutive toll-like receptor 4 (TLR4) were evaluated via flow cytometry. Blood samples from 3 dogs were used to create a concentration-response curve to evaluate whether the observed cytokine modulation was concentration dependent. RESULTS Incubation of canine blood samples with calcitriol resulted in significant decreases in LPS-, LTA-, and MDP-stimulated leukocyte production of TNF but not IL10. Blunting of TNF production was concentration dependent. Leukocyte calcitriol exposure had no significant effect on phagocytosis and TLR4 expression. CONCLUSIONS AND CLINICAL RELEVANCE These data indicated that calcitriol induced an anti-inflammatory shift in canine leukocytes exposed to LPS, LTA, and MDP in vitro, without altering phagocytosis or TLR4 expression. Thus, calcitriol could represent a novel candidate immunomodulatory treatment for dogs.
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Ross JM, Coppotelli G, Amorim J, Hillstedt E, Potts E, Sinclair D. DISRUPTING THE EPIGENOME IN NOVEL NICE MICE TO STUDY AGE-RELATED COGNITIVE DECLINE. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.2333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- J M Ross
- Paul F. Glenn Labs for the Biology of Aging, Harvard Medical School, Boston, Massachusetts, United States
| | - G Coppotelli
- Paul F. Glenn Labs for the Biology of Aging, Harvard Medical School, United States
| | - J Amorim
- Institute of Interdisciplinary Research, University of Coimbra, United States
| | - E Hillstedt
- Department of Neuroscience, Karolinska Institutet, Sweden
| | - E Potts
- Paul F. Glenn Center Labs for the Biology of Aging, Harvard Medical School, United States
| | - D Sinclair
- Paul F. Glenn Labs for the Biology of Aging, Harvard Medical School, United States
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Jaffey JA, Amorim J, DeClue AE. Effects of calcitriol on apoptosis, toll-like receptor 4 expression, and cytokine production of endotoxin-primed canine leukocytes. Am J Vet Res 2018; 79:1071-1078. [DOI: 10.2460/ajvr.79.10.1071] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Jaffey JA, Amorim J, DeClue AE. Effect of calcitriol on in vitro whole blood cytokine production in critically ill dogs. Vet J 2018; 236:31-36. [PMID: 29871746 DOI: 10.1016/j.tvjl.2018.04.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 04/14/2018] [Accepted: 04/17/2018] [Indexed: 12/20/2022]
Abstract
Hypovitaminosis D has been identified as a predictor of mortality in human beings, dogs, cats and foals. However, the immunomodulatory effects of vitamin D in critically ill dogs has not been evaluated. The aim of this study was to evaluate the effect of calcitriol on cytokine production from whole blood collected from critically ill dogs in vitro. Twelve critically ill dogs admitted to a veterinary intensive care unit (ICU) were enrolled in a prospective cohort study. Whole blood from these dogs was incubated with calcitriol (2×10-7M) or ethanol (control) for 24h. Subsequent to this incubation, lipopolysaccharide (LPS)-stimulated whole blood production of tumor necrosis factor (TNF)-α, interleukin (IL)-6 and IL-10 were measured using a canine-specific multiplex assay. Calcitriol significantly increased LPS-stimulated whole blood production of IL-10 and decreased TNF-α production without significantly altering IL-6 production. There was no significant difference in whole blood cytokine production capacity between survivors and non-survivors at the time of discharge from the ICU or 30days after discharge. These data suggests that calcitriol induces an anti-inflammatory phenotype in vitro in whole blood from critically ill dogs.
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Affiliation(s)
- J A Jaffey
- Comparative Internal Medicine Laboratory, Veterinary Health Center, University of Missouri, 900 East Campus Drive, Columbia, MO 65211, USA
| | - J Amorim
- Comparative Internal Medicine Laboratory, Veterinary Health Center, University of Missouri, 900 East Campus Drive, Columbia, MO 65211, USA
| | - A E DeClue
- Comparative Internal Medicine Laboratory, Veterinary Health Center, University of Missouri, 900 East Campus Drive, Columbia, MO 65211, USA.
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Abstract
Background People with critical illness (CI) commonly develop various forms of immune dysfunction, however, there is limited information concerning immune dysfunction in dogs with CI. Hypothesis The immune response in CI dogs differs from that of healthy dogs. Animals Immunologic variables were compared between 14 dogs with CI, defined as APPLEfast score of >20 points, admitted to the University of Missouri Veterinary Health Center Small Animal Clinic Intensive Care Unit and healthy controls (n = 15). Methods Cohort study evaluating constitutive and lipopolysaccharide (LPS)‐stimulated TNF‐α, IL‐6, and IL‐10 production, phagocytosis of opsonized E. coli and respiratory burst capacity after opsonized E. coli or phorbol 12‐myristate 13‐acetate (PMA) stimulation, peripheral blood lymphocyte phenotype, and monocyte expressions of HLA‐DR and TLR‐4. Results Lipopolysaccharide‐stimulated leukocyte TNF‐α (median, Q1, Q3; CI, 49, 49, 120; control, 655, 446, 1174 pg/mL; P = < 0.001), IL‐6 (median, Q1, Q3; CI, 49, 49, 64; control, 100, 49, 166 pg/mL; P = 0.029), and IL‐10 (CI, 49, 49, 56; control, 96, 49, 203 pg/mL; P = 0.014) production and both E. coli (median, Q1, Q3; CI, 60.5, 43, 88.5; control, 86.6, 81, 89.2%; P = 0.047) and PMA (CI, 40, 11.7, 70; control, 93, 83, 97.6%; P = < 0.001)‐stimulated respiratory burst capacity significantly decreased in CI dogs. Percentage of monocytes expressing TLR‐4 greater in the CI dogs (median, Q1, Q3; CI, 46.9, 24.3, 64.2; control, 16.4, 9.4, 26.2%; P = 0.005). Conclusion These findings suggest dogs with CI develop immune system alterations that result in reduced respiratory burst function and cytokine production despite upregulation of TLR‐4.
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Affiliation(s)
- D Hoffman
- The Comparative Internal Medicine Laboratory, University of Missouri College of Veterinary Medicine, Columbia, MO
| | - J Amorim
- The Comparative Internal Medicine Laboratory, University of Missouri College of Veterinary Medicine, Columbia, MO
| | - A DeClue
- The Comparative Internal Medicine Laboratory, University of Missouri College of Veterinary Medicine, Columbia, MO
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Halpin RE, Saunders RS, Thompson BJ, Rohde Newgent AS, Amorim J, Melillo GN, DeClue AE. Evaluation of a feline-specific multiplex, bead-based assay for detection of cytokines, chemokines, growth factors, and other immunologically active proteins in serum and plasma samples from cats. Am J Vet Res 2017; 77:495-504. [PMID: 27111017 DOI: 10.2460/ajvr.77.5.495] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate a feline-specific multiplex, bead-based assay system for detection of recombinant and native proteins in serum samples and in EDTA-treated and heparinized plasma samples. SAMPLE Serum samples and EDTA-treated and heparinized plasma samples from 30 sick cats and 9 healthy client-owned cats and heparinized whole blood samples from 5 healthy purpose-bred cats. PROCEDURES Ability of the assay system to detect 19 recombinant and native immunologically active proteins in plasma and serum samples from healthy and purpose-bred cats was evaluated via spike-and-recovery tests, assessments of inter- and intra-assay variation, linearity results, and leukocyte stimulation. Effects of various concentrations of heparin and serum matrix solution on percentages of analytes recovered were also evaluated. Analyte concentrations in samples from healthy and sick cats were measured and compared between groups. RESULTS Percentages of analytes recovered were unsatisfactory for most assays. Serum and heparinized plasma samples yielded better recovery results than did EDTA-treated plasma samples. Use of serum matrix solution did not improve results. Use of heparin concentrations greater than the recommended range affected the results. Linearity of results was difficult to assess because of the poor recovery. For the analytes that were recovered sufficiently for assessment, linearity appeared to be reasonable despite the limited detection. CONCLUSIONS AND CLINICAL RELEVANCE Poor percentages of analytes recovered and adverse effects of sample protein matrix limited the usefulness of the multiplex, bead-based assay system for measurement of immunologically active proteins in solutions with high protein content; however, recovery results were fairly linear, potentially allowing evaluation of feline plasma or serum samples with high analyte concentrations.
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Zhang Y, Axiak-Bechtel S, Friedman Cowan C, Amorim J, Tsuruta K, DeClue AE. Evaluation of immunomodulatory effect of recombinant human granulocyte-macrophage colony-stimulating factor on polymorphonuclear cell from dogs with cancerin vitro. Vet Comp Oncol 2016; 15:968-979. [DOI: 10.1111/vco.12236] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Revised: 03/22/2016] [Accepted: 03/22/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Y. Zhang
- Comparative Internal Medicine Laboratory, Department of Veterinary Medicine and Surgery, College of Veterinary Medicine; University of Missouri; Columbia MO 65211 USA
| | - S. Axiak-Bechtel
- Comparative Oncology Laboratory, Department of Veterinary Medicine and Surgery, College of Veterinary Medicine; University of Missouri; Columbia MO 65211 USA
| | - C. Friedman Cowan
- Comparative Internal Medicine Laboratory, Department of Veterinary Medicine and Surgery, College of Veterinary Medicine; University of Missouri; Columbia MO 65211 USA
| | - J. Amorim
- Comparative Internal Medicine Laboratory, Department of Veterinary Medicine and Surgery, College of Veterinary Medicine; University of Missouri; Columbia MO 65211 USA
| | - K. Tsuruta
- Comparative Internal Medicine Laboratory, Department of Veterinary Medicine and Surgery, College of Veterinary Medicine; University of Missouri; Columbia MO 65211 USA
| | - A. E. DeClue
- Comparative Internal Medicine Laboratory, Department of Veterinary Medicine and Surgery, College of Veterinary Medicine; University of Missouri; Columbia MO 65211 USA
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Axiak-Bechtel SM, Tsuruta K, Amorim J, Donaldson R, Lino G, Honaker A, Monibi F, Dodam J, DeClue A. Effects of tramadol and o-desmethyltramadol on canine innate immune system function. Vet Anaesth Analg 2015; 42:260-8. [DOI: 10.1111/vaa.12201] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 04/06/2014] [Indexed: 11/26/2022]
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Muñoz JE, Luft VD, Amorim J, Magalhães A, Thomaz L, Nosanchuk JD, Travassos LR, Taborda CP. Immunization with P10 peptide increases specific immunity and protects immunosuppressed BALB/c mice infected with virulent yeasts of Paracoccidioides brasiliensis. Mycopathologia 2014; 178:177-88. [PMID: 25135302 DOI: 10.1007/s11046-014-9801-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 08/07/2014] [Indexed: 11/29/2022]
Abstract
Paracoccidioidomycosis is a systemic granulomatous disease caused by Paracoccidioides spp. A peptide from the major diagnostic antigen gp43, named P10, induces a T-CD4(+) helper-1 immune response in mice and protects against intratracheal challenge with virulent P. brasiliensis. Previously, we evaluated the efficacy of the P10 peptide alone or combined with antifungal drugs in mice immunosuppressed and infected with virulent isolate of P. brasiliensis. In the present work, our data suggest that P10 immunization leads to an effective cellular immune response associated with an enhanced T cell proliferative response. P10-stimulated splenocytes increased nitric oxide (NO) production and induced high levels of IFN-γ, IL-1β and IL-12. Furthermore, significantly increased concentrations of pro-inflammatory cytokines were also observed in lung homogenates of immunized mice. P10 immunization was followed by minimal fibrosis in response to infection. Combined with antifungal drugs, P10 immunization most significantly improved survival of anergic infected mice. Administration of either itraconazole or sulfamethoxazole/trimethoprim together with P10 immunization resulted in 100 % survival up to 200 days post-infection, whereas untreated mice died within 80 days. Hence, our data show that P10 immunization promotes a strong specific immune response even in immunocompromised hosts and thus P10 treatment represents a powerful adjuvant therapy to chemotherapy.
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Affiliation(s)
- Julián E Muñoz
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 1374, São Paulo, SP, 05008-900, Brazil
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20
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21
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Declue AE, Yu DH, Prochnow S, Axiak-Bechtel S, Amorim J, Tsuruta K, Donaldson R, Lino G, Monibi F, Honaker A, Dodam J. Effects of opioids on phagocytic function, oxidative burst capacity, cytokine production and apoptosis in canine leukocytes. Vet J 2014; 200:270-5. [PMID: 24679456 DOI: 10.1016/j.tvjl.2014.02.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 02/05/2014] [Accepted: 02/11/2014] [Indexed: 01/10/2023]
Abstract
Opioids alter immune and apoptotic pathways in several species. They are commonly used in companion animals affected with infectious and/or inflammatory disease, but the immunomodulatory and apoptotic effects of these drugs in dogs are relatively unknown. The aim of the present study was to evaluate the effects of morphine, buprenorphine and fentanyl on canine phagocyte function, oxidative burst capacity, leukocyte cytokine production, and lymphocyte apoptosis. Blood from six healthy adult dogs was incubated in the presence or absence of morphine (200 ng/mL), buprenorphine (10 ng/mL) or fentanyl (10 ng/mL) for 3 h (phagocytic function; cytokine production) or 8 h (apoptosis). Neutrophil phagocytosis of opsonized Escherichia coli, respiratory burst capacity after stimulation with opsonized E. coli or phorbol 12-myristate 13-acetate (PMA), and Annexin V-FITC staining of apoptotic lymphocytes were evaluated using flow cytometry. Leukocyte production of tumor necrosis factor (TNF)-α, interleukin (IL)-6 and IL-10 was assessed after incubation with lipopolysaccharide (LPS), lipoteichoic acid (LTA) or peptidoglycan. Morphine promoted a more intense respiratory burst. Morphine, buprenorphine and fentanyl all promoted LPS- or LTA-induced TNF-α and IL-10 production. However, the opioids tested did not alter TNF-α:IL-10 ratios. Morphine, buprenorphine and fentanyl all inhibited neutrophil apoptosis, an effect that was not concentration dependent in nature. These data indicate that opioids alter immune and apoptotic pathways in dogs. The possible effects of opioids on immune and cellular responses should be considered when designing studies and interpreting outcomes of studies involving administration of opioids in dogs.
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Affiliation(s)
- Amy E Declue
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, University of Missouri, 900 East Campus Drive, Columbia, Missouri 65211, USA.
| | - Do-Hyeon Yu
- College of Veterinary Medicine, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, Korea
| | - Sarah Prochnow
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, University of Missouri, 900 East Campus Drive, Columbia, Missouri 65211, USA
| | - Sandra Axiak-Bechtel
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, University of Missouri, 900 East Campus Drive, Columbia, Missouri 65211, USA
| | - Juliana Amorim
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, University of Missouri, 900 East Campus Drive, Columbia, Missouri 65211, USA
| | - Kaoru Tsuruta
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, University of Missouri, 900 East Campus Drive, Columbia, Missouri 65211, USA
| | - Rebecca Donaldson
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, University of Missouri, 900 East Campus Drive, Columbia, Missouri 65211, USA
| | - Giulia Lino
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, University of Missouri, 900 East Campus Drive, Columbia, Missouri 65211, USA
| | - Farrah Monibi
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, University of Missouri, 900 East Campus Drive, Columbia, Missouri 65211, USA
| | - Allison Honaker
- Sarasota Dolphin Research Program, Chicago Zoological Society c/o Mote Marine Laboratory, Sarasota, FL, USA
| | - John Dodam
- Comparative Internal Medicine Laboratory, College of Veterinary Medicine, University of Missouri, 900 East Campus Drive, Columbia, Missouri 65211, USA
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22
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Affiliation(s)
- J Amorim
- Paediatric Haematology Department, Centro Hospitalar do Porto, Porto, Portugal.
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23
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Souza-Corrêa JA, Ridenti MA, Oliveira C, Araújo SR, Amorim J. Decomposition of Lignin from Sugar Cane Bagasse during Ozonation Process Monitored by Optical and Mass Spectrometries. J Phys Chem B 2013; 117:3110-9. [DOI: 10.1021/jp3121879] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. A. Souza-Corrêa
- Laboratório
Nacional
de Ciência e Tecnologia do Bioetanol − CTBE/CNPEM, 13083-970, Campinas, São Paulo,
Brazil
| | - M. A. Ridenti
- Laboratório
Nacional
de Ciência e Tecnologia do Bioetanol − CTBE/CNPEM, 13083-970, Campinas, São Paulo,
Brazil
- Instituto de Física
Gleb
Wataghin, Universidade Estadual de Campinas − UNICAMP, 13083-859, Campinas, São Paulo, Brazil
| | - C. Oliveira
- Laboratório
Nacional
de Ciência e Tecnologia do Bioetanol − CTBE/CNPEM, 13083-970, Campinas, São Paulo,
Brazil
| | - S. R. Araújo
- Laboratório Nacional de
Nanotecnologia − LNNANO/LME/CNPEM, Rua Giuseppe Máximo Scolfaro, 10.000, Polo II de Alta Tecnologia,
13083-100, Campinas, São Paulo, Brazil
| | - J. Amorim
- Laboratório
Nacional
de Ciência e Tecnologia do Bioetanol − CTBE/CNPEM, 13083-970, Campinas, São Paulo,
Brazil
- Instituto de Física
Gleb
Wataghin, Universidade Estadual de Campinas − UNICAMP, 13083-859, Campinas, São Paulo, Brazil
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Diogo M, Faustino C, Pimentel T, Amorim J, Tavares I. Nephrotic syndrome in plasma cell leukaemia--a rare presentation. Indian J Cancer 2011; 48:131-2. [PMID: 21330765 DOI: 10.4103/0019-509x.76644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Loureiro J, Amorim J. Possibility of nonexistence of hot and superhot hydrogen atoms in electrical discharges. Phys Rev E 2011; 82:035401. [PMID: 21230132 DOI: 10.1103/physreve.82.035401] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2010] [Revised: 08/04/2010] [Indexed: 11/07/2022]
Abstract
Recently, the existence of extremely energetic hydrogen atoms in electrical discharges has been proposed in the literature with large controversy, from the analysis of the anomalous broadening of hydrogen Balmer lines. In this paper, the velocity distribution of H atoms and the profiles of the emitting atom lines created by the exothermic reaction H2++H{2}→H{3}{+}+H+ΔE are calculated, as a function of the internal energy defect ΔE . The shapes found for the non-Maxwell-Boltzmann distributions resulting in non-Gaussian line profiles raise serious arguments against the existence of hot and superhot H atoms as it has been proposed, at least with those temperatures.
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Affiliation(s)
- J Loureiro
- Instituto de Plasmas e Fusão Nuclear-Laboratório Associado, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal.
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Reis JL, Amorim J, Dal Pino A. Occupancy of rotational population in molecular spectra based on nonextensive statistics. Phys Rev E Stat Nonlin Soft Matter Phys 2011; 83:017401. [PMID: 21405796 DOI: 10.1103/physreve.83.017401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Revised: 11/26/2010] [Indexed: 05/30/2023]
Abstract
The procedure to obtain gas temperature in plasmas is to fit the experimental rotational spectrum to a theoretical one based on the Boltzmann distribution. For many systems a single distribution fails to account for the occupation of the levels. Researchers have improved the fitting by coupling two distributions and obtaining two distinct temperatures. They assigned the lowest temperature to the gas. Here, we show that these systems should be described by Tsallis nonextensive statistics and its unique associated temperature. Experimental and simulated spectra are tested and excellent agreement is obtained.
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Affiliation(s)
- J L Reis
- Departamento de Física, Instituto Tecnológico de Aeronáutica, 12228-900 São José dos Campos, São Paulo, Brazil
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Costa B, Viana-Pereira M, Costa S, Lima J, Soares P, Amorim J, Linhares P, Pinheiro C, Oliveira P, Reis R. 95 Associations between functional EGFR polymorphisms and glioma risk. EJC Suppl 2010. [DOI: 10.1016/s1359-6349(10)70903-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Amorim J, Pitarresi G. Investigation on the indentation behavior of sandwich beams using crushable and hyperelastic foam cores. EPJ Web of Conferences 2010. [DOI: 10.1051/epjconf/20100624002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Martinho O, Longatto-Filho A, Lambros MBK, Martins A, Pinheiro C, Silva A, Pardal F, Amorim J, Mackay A, Milanezi F, Tamber N, Fenwick K, Ashworth A, Reis-Filho JS, Lopes JM, Reis RM. Expression, mutation and copy number analysis of platelet-derived growth factor receptor A (PDGFRA) and its ligand PDGFA in gliomas. Br J Cancer 2009; 101:973-82. [PMID: 19707201 PMCID: PMC2743351 DOI: 10.1038/sj.bjc.6605225] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 05/21/2009] [Accepted: 07/08/2009] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND Malignant gliomas are the most prevalent type of primary brain tumours but the therapeutic armamentarium for these tumours is limited. Platelet-derived growth factor (PDGF) signalling has been shown to be a key regulator of glioma development. Clinical trials evaluating the efficacy of anti-PDGFRA therapies on gliomas are ongoing. In this study, we intended to analyse the expression of PDGFA and its receptor PDGFRA, as well as the underlying genetic (mutations and amplification) mechanisms driving their expression in a large series of human gliomas. METHODS PDGFA and PDGFRA expression was evaluated by immunohistochemistry in a series of 160 gliomas of distinct World Health Organization (WHO) malignancy grade. PDGFRA-activating gene mutations (exons 12, 18 and 23) were assessed in a subset of 86 cases by PCR-single-strand conformational polymorphism (PCR-SSCP), followed by direct sequencing. PDGFRA gene amplification analysis was performed in 57 cases by quantitative real-time PCR (QPCR) and further validated in a subset of cases by chromogenic in situ hybridisation (CISH) and microarray-based comparative genomic hybridisation (aCGH). RESULTS PDGFA and PDGFRA expression was found in 81.2% (130 out of 160) and 29.6% (48 out of 160) of gliomas, respectively. Its expression was significantly correlated with histological type of the tumours; however, no significant association between the expression of the ligand and its receptor was observed. The absence of PDGFA expression was significantly associated with the age of patients and with poor prognosis. Although PDGFRA gene-activating mutations were not found, PDGFRA gene amplification was observed in 21.1% (12 out of 57) of gliomas. No association was found between the presence of PDGFRA gene amplification and expression, excepting for grade II diffuse astrocytomas. CONCLUSION The concurrent expression of PDGFA and PDGFRA in different subtypes of gliomas, reinforce the recognised significance of this signalling pathway in gliomas. PDGFRA gene amplification rather than gene mutation may be the underlying genetic mechanism driving PDGFRA overexpression in a portion of gliomas. Taken together, our results could provide in the future a molecular basis for PDGFRA-targeted therapies in gliomas.
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Affiliation(s)
- O Martinho
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710 Braga, Portugal
| | - A Longatto-Filho
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710 Braga, Portugal
- Instituto Adolfo Lutz, 355-01246-902 São Paulo, Brazil
| | - M B K Lambros
- The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK
| | - A Martins
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710 Braga, Portugal
| | - C Pinheiro
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710 Braga, Portugal
| | - A Silva
- Department of Pathology, S. Marcos Hospital, 4710 Braga, Portugal
| | - F Pardal
- Department of Pathology, S. Marcos Hospital, 4710 Braga, Portugal
| | - J Amorim
- Department of Oncology, S. Marcos Hospital, 4710 Braga, Portugal
| | - A Mackay
- The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK
| | - F Milanezi
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710 Braga, Portugal
- IPATIMUP, 4200 Porto, Portugal
| | - N Tamber
- The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK
| | - K Fenwick
- The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK
| | - A Ashworth
- The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK
| | - J S Reis-Filho
- The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK
| | - J M Lopes
- IPATIMUP, 4200 Porto, Portugal
- Medical Faculties of Porto University, 4200 Porto, Portugal
| | - R M Reis
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710 Braga, Portugal
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Abstract
Introduction:Drug-induced increased libido has been reported mainly with dopaminergic agents. Although benzodiazepines may cause behavioural dishinibition, they were rarely related to sexual undesired urges.Case:A 62-year-old woman was seen for breast mucinous carcinoma. Besides mild hypertension and initial insomnia she was otherwise previously healthy. She was chronically medicated with ramipril and diazepam 5mg id. Tumour ressection was carried out and chemotherapy with FEC-T was began. One week after, in a follow-up visit, she complained having difficulties on sleep onset. Lorazepam 1mg at the bedtime was prescribed. After the first dose she felt an overwhelming sexual desire, the urge making her to repeatedly open and close her legs, feeling even the physical intercourse. This sensation fade gradually over the next few hours. On the following day she decided to take another lorazepam pill to be sure it was the cause of that strange feelings. The symptoms of the previous night were completely reproduced. She has now completed the chemotherapy and proposed to adjuvant radiotherapy. She never felt those symptoms again and did not take another lorazepam.Conclusion:It is believed that dopaminomimetic drugs can heighten sexual desire by increasing dopamine concentration on the mesolimbic pathway. In this way, benzodiazepines, as GABA enhancers, would inhibit dopamine release leading to reduced libido. On the other hand, GABA also inhibits serotoninergic-mediated vigilance and impulse control, leading to dishinibition and impulsivity. In our patient, lorazepam has caused a “virtual intercourse” as previously found in electric and mechanic stimulation of septal region and amygdala.
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Livermore DM, Struelens M, Amorim J, Baquero F, Bille J, Canton R, Henning S, Gatermann S, Marchese A, Mittermayer H, Nonhoff C, Oakton KJ, Praplan F, Ramos H, Schito GC, Van Eldere J, Verhaegen J, Verhoef J, Visser MR. Multicentre evaluation of the VITEK 2 Advanced Expert System for interpretive reading of antimicrobial resistance tests. J Antimicrob Chemother 2002; 49:289-300. [PMID: 11815570 DOI: 10.1093/jac/49.2.289] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Interpretive reading analyses the complete resistance profiles of bacteria to multiple antibiotics and infers the resistance mechanisms present; it aids therapeutic choice and enhances surveillance data. We evaluated the Advanced Expert System (AES), which interprets MICs generated by the VITEK 2. Ten European laboratories tested 42 reference strains and 76-106 of their own strains, representing important resistance genotypes. Interpretive reading by the VITEK 2 AES achieved full agreement with genotype data for 88-89% of strains, with the correct mechanism identified as one of two possibilities for a further 5-6%. Mechanisms inferred with 90% agreement with reference data included methicillin resistance in staphylococci, glycopeptide resistance in enterococci, quinolone resistance in staphylococci and Enterobacteriaceae, AAC(6')-APH(2")-mediated aminoglycoside resistance in Gram-positive cocci, erm-mediated macrolide resistance in pneumococci, extended-spectrum beta-lactamases (ESBLs) in Enterobacteriaceae and Pseudomonas aeruginosa, and acquired penicillinases in Enterobacteriaceae. VanA, VanB and VanC phenotypes of enterococci were distinguished reliably, and ESBL production was accurately inferred in AmpC-inducible species as well as Escherichia coli and Klebsiella spp. Mechanisms identified, but only as possibilities among several, included IRT-type beta-lactamases and individual aminoglycoside-modifying enzymes in Enterobacteriaceae. Most disagreements with reference data concerned pneumococci found to have high-level penicillin resistance by the VITEK 2 AES but previously determined, phenotypically, to have intermediate resistance. When ESBL production was inferred in E. coli and klebsiellae, the VITEK 2 AES edited susceptible results for cephalosporins (except cefoxitin) to resistant; when an acquired penicillinase was inferred in Enterobacteriaceae, piperacillin results were edited to resistant; and when staphylococci were found methicillin resistant, resistance was reported for all beta-lactams. Further editing may be desirable (e.g. of cephalosporin results for salmonellas inferred to have ESBLs).
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Affiliation(s)
- D M Livermore
- Antibiotic Resistance Monitoring & Reference Laboratory, Central Public Health Laboratory, 61 Colindale Avenue, London NW9 5HT, UK.
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Amorim J, Loureiro J, Schram D. Formation of H− ions via vibrational excited molecules produced from recombinative wall desorption of H atoms in a low-pressure H2 positive column. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)00977-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Amorim J, Lino J, Loureiro J, Lima M, da Paixão F. Superelastic collisions of electrons with the c metastable state in hydrogen dc positive column. Chem Phys 1999. [DOI: 10.1016/s0301-0104(99)00166-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Loureiro J, Amorim J. Dependence of volume-produced H− ions on the wall recombination probability of H atoms in a low pressure H2 positive column. Chem Phys 1998. [DOI: 10.1016/s0301-0104(98)00088-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Broeiro P, Ramos V, Tavares I, Cunha E, Amorim J. [The assessment of functional status in the elderly. The application of a Portuguese version of the COOP/WONCA charts]. ACTA MEDICA PORT 1995; 8:279-88. [PMID: 7625227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
INTRODUCTION The outcomes of medical care can be measured in terms of health or functional status. Several outcomes measures have been developed in the last years but, there are several difficulties with cross-cultural adaptations. This study is mainly an application exercise to a group of old people of a Portuguese version of the COOP/WONCA charts. METHODS A descriptive cross-sectional study with a component of qualitative analysis was done. Population basis was the elderly registered in the lists of five family doctors in two Portuguese health centres (Lumiar and Costa da Caparica) in the Lisbon region. A random sample of 189 patients (aged 65 and over) was interviewed. The studied variables were: gender, age, civil status, literacy, co-morbidity and dimensions of the COOP/WONCA charts. Univariate and bivariate analysis was done. A qualitative analysis was also performed to approach relevancy and acceptability of the charts to the elderly. RESULTS 23% of the elderly had important limitations (values 4 and 5 of the charts) in physical fitness, 25% had unfavourable repercussions in feelings (values 4 and 5), 12% had important difficulties (value 4 and 5) in every-day life activities and 7% had important limitations in social life. 66% had no changes in their health in the last two weeks, 18% got better and 16% got worse. 21% valued their overall health as fair or poor, 47% as good and 24% as very good or excellent. Moderate to severe pain in the last two weeks was reported by 55% of the patients. Female reported in general worse scores than males. Statistical significance was found in the association between the number of the co-existent health problems in the same person (co-morbidity) and the values of some dimensions of the COOP/WONCA charts. In the half of the cases where the Katz index was measured there were non-concordance with the measures of the daily life of the COOP/WONCA charts. The charts had good acceptability and applicability but also some difficulties for illiterate elderly. DISCUSSION Although the use of COOP/WONCA charts could be difficult with elderly patients the present study showed its applicability and utility in the everyday clinical practice. The charts open new possibilities for international comparisons on functional status assessment.
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Amorim J, Pinotti JA, Schapiro M, Casanova R. [Fecaloma in acquired megacolon as a factor in dystocia in labor. Report of a case]. Matern Infanc (Sao Paulo) 1968; 26:353-5. [PMID: 5754144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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